#include <math.h>
#include "slu_scomplex.h"
#include "slu_Cnames.h"

int icmax1_(int *n, complex *cx, int *incx)
{
    /*  -- LAPACK auxiliary routine (version 2.0) --
           Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
           Courant Institute, Argonne National Lab, and Rice University
           September 30, 1994


        Purpose
        =======

        ICMAX1 finds the index of the element whose real part has maximum
        absolute value.

        Based on ICAMAX from Level 1 BLAS.
        The change is to use the 'genuine' absolute value.

        Contributed by Nick Higham for use with CLACON.

        Arguments
        =========

        N       (input) INT
                The number of elements in the vector CX.

        CX      (input) COMPLEX array, dimension (N)
                The vector whose elements will be summed.

        INCX    (input) INT
                The spacing between successive values of CX.  INCX >= 1.

       =====================================================================



           NEXT LINE IS THE ONLY MODIFICATION.


       Parameter adjustments
           Function Body */
    /* System generated locals */
    int ret_val, i__1, i__2;
    float r__1;
    /* Local variables */
    static float smax;
    static int i, ix;


#define CX(I) cx[(I)-1]


    ret_val = 0;
    if (*n < 1) {
        return ret_val;
    }
    ret_val = 1;
    if (*n == 1) {
        return ret_val;
    }
    if (*incx == 1) {
        goto L30;
    }

    /*     CODE FOR INCREMENT NOT EQUAL TO 1 */

    ix = 1;
    smax = (r__1 = CX(1).r, fabs(r__1));
    ix += *incx;
    i__1 = *n;
    for (i = 2; i <= *n; ++i) {
        i__2 = ix;
        if ((r__1 = CX(ix).r, fabs(r__1)) <= smax) {
            goto L10;
        }
        ret_val = i;
        i__2 = ix;
        smax = (r__1 = CX(ix).r, fabs(r__1));
L10:
        ix += *incx;
        /* L20: */
    }
    return ret_val;

    /*     CODE FOR INCREMENT EQUAL TO 1 */

L30:
    smax = (r__1 = CX(1).r, fabs(r__1));
    i__1 = *n;
    for (i = 2; i <= *n; ++i) {
        i__2 = i;
        if ((r__1 = CX(i).r, fabs(r__1)) <= smax) {
            goto L40;
        }
        ret_val = i;
        i__2 = i;
        smax = (r__1 = CX(i).r, fabs(r__1));
L40:
        ;
    }
    return ret_val;

    /*     End of ICMAX1 */

} /* icmax1_ */

